.banner{
    height: 580px;
}
.banner1{
    background: url(../img/banner.jpg);
    background-size: cover;
}
.banner2{
    background: url(../img/banner2.jpg);
    background-size: cover;
}
.banner3{
    background: url(../img/banner3.jpg);
    background-size: cover;
}
@media (max-width:600px) {
    
    .banner{
        height: 250px;
    }
}
.card-text{
    height: 28px;
    overflow: hidden;
}
main{
    padding-top:10px;
    font-family: '微软雅黑';
    background: url(../img/banner4.jpg) fixed;
}
footer{
    padding-bottom: 30px;
    background: #f5f5f5;
}
footer h2{
    margin-top: 30px;
}
footer p{
    margin-top: 20px;
    margin-bottom: 15px;
    font-size: 15px;
}
footer li{
    font-size: 14px;
    list-style: none;
}
footer li a:hover{
    text-decoration: none;
}
